Quatech RS-422 User Manual

Also see for DSCLP-200: User manual Specifications User manual

Contents

Quatech RS-422 User Manual Manual pdf 31 page image

7.1 RTS/CTS HandshakeTransmission of RTS, combined with reception of CTS, allows for hardwarehandshaking (data flow control) between the UART and the external device. RTS istransmitted on AUXOUT by connecting pins 4 and 5 of the jumper block. CTS isreceived on AUXIN by connecting pins 1 and 2 of the jumper block. If RTS/CTShandshaking is not desired, the RTS output can be looped back to the CTS input byconnecting pins 1 and 4 of the jumper block. Figure 19 shows how to select theRTS/CTS mode.Transmit RTS on AUXOUTReceive CTS on AUXIN Loopback RTS to CTSCTSAUXINXCLKRTSAUXOUTRCLK123654 CTSAUXINXCLKRTSAUXOUTRCLK123654Jumpers J5, J7Figure 19 --- RTS/CTS selection7.2 RCLKThis is the clock signal used by the receiver portion of the UART. It is generallyprovided by connecting it to the UART's own transmit clock output (XCLK). This isdone by connecting pins 3 and 6 of the jumper block. If desired, RCLK can bereceived from an external source over the AUXIN line by connecting pins 2 and 3 ofthe jumper block. Figure 20 shows how to select the RCLK mode.Loopback XCLK to RCLK Receive RCLK on AUXINCTSAUXINXCLKRTSAUXOUTRCLK123654 CTSAUXINXCLKRTSAUXOUTRCLK123654Jumpers J5, J7Figure 20 --- RCLK selection26 DSCLP/SSCLP-200/300 User's Manual